You have a strange mind!
???
It's pretty simple. Young Earth Creationists believe that much to most of the fossil bearing geologic strata were deposited by the (single, global) flood, i.e. Noah's flood. So any fossil forest that has fossil bearing rock layers stratagraphically beneath it, if it grew in place, must either have grown in place during the global flood, or at the very best, grown in the short space of time since the flood. But even that won't work if there are "flood" deposits also stratigraphically above it.
For instance the stacked fossil forests at Specimen Ridge in Yellowstone (some 27 distinct forests!) are Eocene in age -- right in the middle of the flood on the classic Morris-Whitcomb model -- and underlain by supposed "flood deposits". How would even one forest grow in the midst of Noah's flood, let alone 27 grow and get buried in succession?
This is exactly why your fellow YECs, however implausibly, deny that most incidences of upright fossil trees, and fossil forests, and certainly those at Specimen Ridge, grew in place.
Is it possible you really don't grasp the difficulty in your position?!
Get an IQ!
Yellowstone is volcanic, and displays much the same kind of geology at the recent Mt St Helens eruption. Stacking during a series of eruptions can happen in days, weeks or months easily.
You are grasping at straws as usual.